Data nerd

The default setting shows GDP against life expectancy. The scale at the bottom can be automatically played to show how the countries of the world have changed. Having nothing selected you’ll see the entire world and I was amazed at the drop that occurred during WWI and while still a drop for WWII it was no where near as dramatic.

You can select a country to highlight and follow; of note was the change in life expectancy in the US during the civil war. There were a lot of interesting things to evaluate and this tool is pretty darn robust. It’s worth a look … especially if you’re a data nerd